Dell OptiPlex 3090 Micro

Questions and Answers

S
Steven WrightAug 18, 2025
What to do if my Dell Desktop has a CPU failure?
- S
  Shawn HernandezAug 18, 2025
  First, run the Dell Support Assist or Dell Diagnostics tool. If the problem continues, consider replacing the system board.
B
Blake WagnerAug 21, 2025
How to fix a Dell OptiPlex 3090 Micro when no memory or RAM is detected?
- J
  Jeremy RollinsAug 21, 2025
  First, make sure the memory module is correctly installed. If the problem persists, replace the memory module.
E
Emily KnightAug 23, 2025
How to fix system board failure on Dell OptiPlex 3090 Micro?
- N
  Nicholas GibsonAug 23, 2025
  Try flashing the latest BIOS version. If the issue persists, the system board may need to be replaced.
J
Jeremy JohnsonAug 26, 2025
What to do if my Dell Desktop has memory/RAM failure?
- M
  Matthew GriffinAug 26, 2025
  Try resetting the memory module. If the problem continues, replace the memory module.
S
Sean JohnsonAug 28, 2025
What to do if my Dell OptiPlex 3090 Micro has an invalid memory installed?
- G
  Gregory ThomasAug 28, 2025
  Reset the memory module. If the problem persists, replace it.
M
Mark GutierrezAug 30, 2025
How do I fix a system board error on my Dell OptiPlex 3090 Micro?
- F
  fkimAug 30, 2025
  Flash the latest BIOS version. If the problem persists, replace the system board.
A
Anna OrozcoSep 1, 2025
What to do if my Dell OptiPlex 3090 Micro Desktop has a BIOS Recovery image not found?
- J
  Jason Reed IIISep 1, 2025
  Flash the latest BIOS version. If the problem persists, replace the system board.
T
thompsonscottSep 3, 2025
What to do if my Dell OptiPlex 3090 Micro has a BIOS Recovery image found but invalid?
- A
  Andrew BurtonSep 4, 2025
  Flash the latest BIOS version. If the issue persists, replace the system board.
M
mdixonSep 6, 2025
What to do if my Dell Desktop has a CMOS battery failure?
- C
  cherylpetersonSep 6, 2025
  Reset the CMOS battery connection. If the problem continues, replace the RTS battery.
T
Travis GarciaSep 8, 2025
What to do if my Dell OptiPlex 3090 Micro Desktop has a PCI or Video card/chip failure?
- M
  Matthew NewtonSep 8, 2025
  Replace the system board.

Summary

Working Inside Your Computer

Safety Instructions

Guidelines for protecting your computer and ensuring personal safety during service procedures.

ESD Protection

Measures to prevent electrostatic discharge damage to sensitive electronic components.

After Working Inside Your Computer

Steps to take after completing internal computer service to ensure proper reassembly.

Removing and Installing Components

Recommended Tools and Screw List

Lists necessary tools and screw types for component removal and installation.

Major Components Overview

Identifies and labels the main internal components of the system.

Side Cover

Procedure for removing and installing the computer's side cover.

Front Bezel

Steps for removing and installing the front bezel of the computer.

Hard-Drive Assembly

Instructions for removing and installing the hard-drive assembly.

Hard-Drive Bracket

Procedure for removing and installing the hard-drive bracket.

2.5-inch Hard-Drive Assembly

Steps for installing the 2.5-inch hard-drive assembly.

M.2 2230 PCIe Solid-State Drive

Guides for removing and installing the M.2 2230 PCIe solid-state drive.

M.2 2280 PCIe Solid-State Drive

Guides for removing and installing the M.2 2280 PCIe solid-state drive.

Fan Assembly

Detailed steps for removing and installing the system's fan assembly.

WLAN Card

Instructions for removing and installing the Wireless Local Area Network (WLAN) card.

Heat Sink

Steps for removing and installing the heat sink assembly.

Coin-Cell Battery

Guides for removing and installing the coin-cell battery.

Memory Modules

Instructions for removing and installing memory modules (RAM).

Speaker

Steps for removing and installing the system speaker.

Optional I;O Modules

Instructions for removing and installing optional I/O modules like Type-C, HDMI, VGA, DP, Serial.

Processor

Detailed steps for removing and installing the computer's processor.

System Board

Comprehensive instructions for removing and installing the system board.

Drivers and Downloads

BIOS Setup

BIOS Overview, Navigation, and Boot Menu

Explains BIOS interaction, navigation keys, and entering the one-time boot menu.

System Setup Options and Configuration

Details general options, system information, boot sequence, and date/time settings.

Security Settings Management

Covers admin/system passwords, secure boot, TPM, and chassis intrusion settings.

Performance and Power Management

Options for optimizing CPU performance, power states, and system startup behavior.

Virtualization, Wireless, Maintenance, and Logs

Configuration for virtualization, wireless devices, system maintenance, and logs.

BIOS Update Procedures

Instructions for updating the system BIOS using various methods.

System and Setup Password Management

Procedures for setting, changing, deleting, and clearing BIOS passwords.

Troubleshooting

SupportAssist Pre-boot Diagnostics and LED Behavior

Guide to running hardware diagnostics and interpreting diagnostic LED codes.

Operating System Recovery and Backup

Procedures for OS recovery, backup options, and WiFi troubleshooting.

Getting Help

Contacting Dell

Information and steps to contact Dell support for sales, technical, or customer service.

Dell OptiPlex 3090 Micro Specifications

General

Audio	Realtek ALC3246 with Waves MaxxAudio Pro
Form Factor	Micro
Processor Options	10th Gen Intel Core i3, i5, i7
Chipset	Intel H470 Chipset
Memory	Up to 64GB DDR4 2933MHz
Storage Options	M.2 PCIe NVMe SSD, 2.5-inch HDD/SSD
Graphics	Intel UHD Graphics 630
Ports (Front)	1x USB 3.2 Gen 1 Type-C, 2x USB 3.2 Gen 1 Type-A, 1x Universal Audio Jack
Ports (Rear)	2 x USB 2.0, 2 x USB 3.2 Gen 1 Type-A, 1 x RJ-45
Operating System	Windows 10 Pro
Dimensions	36.0mm x 178.0mm x 182.0mm
Networking	10/100/1000 Mbps
Wireless	Intel® Wi-Fi 6 AX201, 2x2, 802.11ax with Bluetooth 5.1
Power Supply	65 W adapter